ZipEntry VB.NET WinRT Reference Documentation

ZipEntry

Current Version: 9.5.0.75

Represents a single file or directory entry within a Chilkat Zip object. A zip entry can be one of 5 types (see the description of the EntryType property below).

Object Creation

Dim obj As New Chilkat.ZipEntry()

Properties

Comment
Comment As String

The comment stored within the Zip for this entry.

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CompressedLength
CompressedLength As UInteger (ReadOnly)

The size in bytes of this entry's file data when compression is applied

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CompressedLength64
CompressedLength64 As Int64 (ReadOnly)

The size in bytes of this entry's file data when compression is applied

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CompressionLevel
CompressionLevel As Integer

The compression level. 0 = no compression, while 9 = maximum compression. The default is 6.

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CompressionMethod
CompressionMethod As Integer

Set to 0 for no compression, or 8 for the Deflate algorithm. The Deflate algorithm is the default algorithm of the most popular Zip utility programs, such as WinZip

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Crc
Crc As Integer (ReadOnly)

The CRC for the zip entry. For AES encrypted entries, the CRC value will be 0. (See http://www.winzip.com/aes_info.htm#CRC )

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DebugLogFilePath
DebugLogFilePath As String

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

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EncryptionKeyLen
EncryptionKeyLen As Integer (ReadOnly)
Introduced in version 9.5.0.69

If this entry is AES encrypted, then this property contains the AES key length (128, 192, or 256). If the entry is not AES encrypted, then the value is 0.

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EntryID
EntryID As Integer (ReadOnly)

The unique ID assigned by Zip.NET while the object is instantiated in memory.

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EntryType
EntryType As Integer (ReadOnly)

Indicates the origin of the entry. There are three possible values:

  1. Mapped Entry: An entry in an existing Zip file.
  2. File Entry: A file not yet in memory, but referenced. These entries are added by calling AppendFiles, AppendFilesEx, AppendOneFileOrDir, etc.
  3. Data Entry: An entry containing uncompressed data from memory. These entries are added by calling AppendData, AppendString, etc.
  4. Null Entry: An entry that no longer exists in the .zip.
  5. New Directory Entry: A directory entry added by calling AppendNewDir.
When the zip is written by calling WriteZip or WriteToMemory, all of the zip entries are transformed into mapped entries. They become entries that contain the compressed data within the .zip that was just created. (The WriteZip method call effectively writes the zip and then opens it, replacing all of the existing entries with mapped entries.)

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FileDateTimeStr
FileDateTimeStr As String

The local last-modified date/time in RFC822 string format.

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FileName
FileName As String

The file name of the Zip entry.

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FileNameHex
FileNameHex As String (ReadOnly)

A string containing the hex encoded raw filename bytes found in the Zip entry.

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HeartbeatMs
HeartbeatMs As Integer

The number of milliseconds between each AbortCheck event callback. The AbortCheck callback allows an application to abort inflate/extract/unzip calls prior to completion. If HeartbeatMs is 0 (the default), no AbortCheck event callbacks will fire.

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IsAesEncrypted
IsAesEncrypted As Boolean (ReadOnly)
Introduced in version 9.5.0.69

True if the entry is AES encrypted. This property can only be True for entries already contained in a .zip (i.e. entries obtained from a zip archive that was opened via OpenZip, OpenBd, OpenFromMemory, etc.) The property is False if the entry contained in the zip is not AES encrypted.

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IsDirectory
IsDirectory As Boolean (ReadOnly)

True if the Zip entry is a directory, false if it is a file.

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LastErrorHtml
LastErrorHtml As String (ReadOnly)

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorText
LastErrorText As String (ReadOnly)

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorXml
LastErrorXml As String (ReadOnly)

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastMethodSuccess
LastMethodSuccess As Boolean
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = True and failure = False.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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TextFlag
TextFlag As Boolean

Controls whether the "text flag" of the internal file attributes for this entry within the zip is set. This is a bit flag that indicates whether the file contents are text or binary. It is for informational use and it is not imperative that this bit flag is accurately set. The ability to set this bit flag is only provided to satisfy certain cases where another application might be sensitive to the flag.

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UncompressedLength
UncompressedLength As UInteger (ReadOnly)

The size in bytes of this entry's file data when uncompressed.

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UncompressedLength64
UncompressedLength64 As Int64 (ReadOnly)

The size in bytes of this entry's file data when uncompressed.

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VerboseLogging
VerboseLogging As Boolean

If set to True, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is False. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
Version As String (ReadOnly)

Version of the component/library, such as "9.5.0.63"

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Methods

AppendData
<Awaitable> Function AppendDataAsyncAsync(ByVal inData As Byte()) As IAsyncOperation(Of Boolean)

Appends binary data to the zip entry's file contents.

Returns True for success, False for failure.

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AppendString
<Awaitable> Function AppendStringAsyncAsync(ByVal strContent As String, ByVal charset As String) As IAsyncOperation(Of Boolean)

Appends text data to the zip entry's file contents. The text is appended using the character encoding specified by the charset, which can be "utf-8", "ansi", etc.

Returns True for success, False for failure.

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Copy
Function Copy() As Byte()

Returns the compressed data as a byte array.

Note: The Copy method can only be called if the zip entry already contains compressed data (i.e. it is a "mapped entry"). This is the case when an existing .zip is opened (from memory or from a file), or after the .zip has been written (by calling WriteZip or WriteToMemory). If a zip entry is created via AppendData, AppendFiles, etc., then it does not yet contain compressed data. When the zip is written, each entry becomes a "mapped entry" (The value of the EntryType property becomes 0.)

Returns an empty byte array on failure

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CopyToBase64
Function CopyToBase64() As String

Returns the compressed data as a Base64-encoded string. It is only possible to retrieve the compressed data from a pre-existing .zip that has been opened or after writing the .zip but not closing it.

Note: The CopyToBase64 method can only be called if the zip entry already contains compressed data (i.e. it is a "mapped entry").

Returns Nothing on failure

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CopyToHex
Function CopyToHex() As String

Returns the compressed data as a hexidecimal encoded string. It is only possible to retrieve the compressed data from a pre-existing .zip that has been opened or after writing the .zip but not closing it.

Note: The CopyToBase64 method can only be called if the zip entry already contains compressed data (i.e. it is a "mapped entry").

Returns Nothing on failure

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Extract
<Awaitable> Function ExtractAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Boolean)

Unzips this entry into the specified base directory. The file is unzipped to the subdirectory according to the relative path stored with the entry in the Zip. Use ExtractInto to unzip into a specific directory regardless of the path information stored in the Zip.

Returns True for success, False for failure.

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ExtractInto
<Awaitable> Function ExtractIntoAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Boolean)

Unzip a file into a specific directory. If this entry is a directory, then nothing occurs. (An application can check the IsDirectory property and instead call Extract if it is desired to create the directory.)

Returns True for success, False for failure.

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GetDt
Function GetDt() As CkDateTime

Returns the last-modified date/time of this zip entry.

Returns Nothing on failure

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Inflate
<Awaitable> Function InflateAsyncAsync() As IAsyncOperation(Of Byte())

Inflate a file within a Zip directly into memory.

Returns an empty byte array on failure

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NextEntry
Function NextEntry() As ZipEntry

Return the next entry (file or directory) within the Zip

Returns Nothing on failure

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NextMatchingEntry
Function NextMatchingEntry(ByVal matchStr As String) As ZipEntry
Introduced in version 9.5.0.50

Returns the next entry having a filename matching the matchStr. The "*" characters matches 0 or more of any character. The full filename, including path, is used when matching against the pattern.

Returns Nothing on failure

More Information and Examples
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ReplaceData
Function ReplaceData(ByVal inData As Byte()) As Boolean

Replaces the zip entry's existing contents with new data.

Returns True for success, False for failure.

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ReplaceString
Function ReplaceString(ByVal strContent As String, ByVal charset As String) As Boolean

Replaces the zip entry's existing contents with new text data. The text will be stored using the character encoding as specified by charset, which can be "utf-8", "ansi", etc.

Returns True for success, False for failure.

More Information and Examples
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SetDt
Sub SetDt(ByVal dt As CkDateTime)

Sets the last-modified date/time for this zip entry.

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UnzipToBd
<Awaitable> Function UnzipToBdAsyncAsync(ByVal binData As BinData) As IAsyncOperation(Of Boolean)
Introduced in version 9.5.0.67

Unzips the entry contents into the binData.

Returns True for success, False for failure.

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UnzipToSb
<Awaitable> Function UnzipToSbAsyncAsync(ByVal lineEndingBehavior As Integer, ByVal srcCharset As String, ByVal sb As StringBuilder) As IAsyncOperation(Of Boolean)
Introduced in version 9.5.0.67

Unzips a text file to the sb. The contents of sb are appended with the unzipped file. The lineEndingBehavior is as follows:

0 = leave unchanged.
1 = convert all to bare LF's
2 = convert all to CRLF's

The srcCharset tells the component how to interpret the bytes of the uncompressed file -- i.e. as utf-8, utf-16, windows-1252, etc.

Returns True for success, False for failure.

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UnzipToStream
<Awaitable> Function UnzipToStreamAsyncAsync(ByVal toStream As Stream) As IAsyncOperation(Of Boolean)
Introduced in version 9.5.0.67

Unzips a file within a Zip to a stream. If called synchronously, the toStream must have a sink, such as a file or another stream object. If called asynchronously, then the foreground thread can read the stream.

Returns True for success, False for failure.

More Information and Examples
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UnzipToString
<Awaitable> Function UnzipToStringAsyncAsync(ByVal lineEndingBehavior As Integer, ByVal srcCharset As String) As IAsyncOperation(Of String)

Inflate and return the uncompressed data as a string The lineEndingBehavior is as follows:

0 = leave unchanged.
1 = convert all to bare LF's
2 = convert all to CRLF's

The srcCharset tells the component how to interpret the bytes of the uncompressed file -- i.e. as utf-8, utf-16, windows-1252, etc.

Returns Nothing on failure

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Events